A prism of an equilateral triangle base , its height is triple the length of its base if the length of its base increases by rate 0.01 cm/sec . Find the rate of increase of volume of the prism at length of base 5 root3 cm

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- Mar 3rd 2013, 08:44 AMmido22rate of change according to time problem
A prism of an equilateral triangle base , its height is triple the length of its base if the length of its base increases by rate 0.01 cm/sec . Find the rate of increase of volume of the prism at length of base 5 root3 cm

- Mar 3rd 2013, 11:36 AMHallsofIvyRe: rate of change according to time problem
I'm not sure what you mean by "the length of its base". The obvious thing is the length of a

**side**of the triangle but another possibility is the length of an altitude.

First, can you write the formula for volume of such a prism with base side length s and height h? - Mar 3rd 2013, 01:06 PMmido22Re: rate of change according to time problem
the base length means -->the length of a side of the triangle

here is my attempt :

volume of prism = area of base * height .....assume that base length = x ,, height of prism = h = 3x

so

by taking derivative with respect to time

so

by substituting i found that

is that right?????(Worried)